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keep-failed causes failed outputs to exist in the store as their normal names #657

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opened 2025-02-04 22:20:40 +00:00 by jade · 0 comments
jade commented 2025-02-04 22:20:40 +00:00
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If you build a derivation that fails and you have keep-failed set, any of the outputs it's created will stay in their original positions in /nix/store. This leads to unregistered paths existing in the store which do not have good build provenance.

Also I don't think I want to know why, but mkdir -p $out succeeds and is normal in derivations. Does this imply that on macOS and other platforms without chroot, you can make random files in /nix/store which the daemon has to clean up? Probably. It probably does. Ew.

If you build a derivation that fails and you have keep-failed set, any of the outputs it's created will stay in their original positions in /nix/store. This leads to unregistered paths existing in the store which do not have good build provenance. Also I don't think I want to know why, but mkdir -p $out succeeds and is normal in derivations. Does this imply that on macOS and other platforms without chroot, you can make random files in /nix/store which the daemon has to clean up? Probably. It probably does. Ew.
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Probably affects CppNix. This is a best-effort tag for troubles in old code; it exists to inform the CppNix team about problems they might care about also.

  
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Found in Lix nightly.

  
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Reference: lix-project/lix#657
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